convert RRuntime raw utilities to use byte representation

...n/src/com/oracle/truffle/r/nodes/builtin/base/Unlist.java

.../com/oracle/truffle/r/nodes/unary/CastDoubleBaseNode.java

.../src/com/oracle/truffle/r/nodes/unary/CastDoubleNode.java

...com/oracle/truffle/r/nodes/unary/CastIntegerBaseNode.java

...src/com/oracle/truffle/r/nodes/unary/CastIntegerNode.java

...com/oracle/truffle/r/nodes/unary/CastLogicalBaseNode.java

...src/com/oracle/truffle/r/nodes/unary/CastLogicalNode.java

.../com/oracle/truffle/r/nodes/unary/ConvertBooleanNode.java

...rc/com/oracle/truffle/r/nodes/unary/FirstBooleanNode.java

....r.runtime/src/com/oracle/truffle/r/runtime/RRuntime.java

...r.runtime/src/com/oracle/truffle/r/runtime/data/RRaw.java

...ime/src/com/oracle/truffle/r/runtime/data/RRawVector.java

...ffle/r/runtime/data/closures/RToComplexVectorClosure.java

...uffle/r/runtime/data/closures/RToDoubleVectorClosure.java

.../truffle/r/runtime/data/closures/RToIntVectorClosure.java